Safety attachment for compression refrigerating apparatus.



SMETY ATTACHMENT FOR COMPRESSION BEFRIGERATING APPARATUS.

:LEPLIOATIC'H 511L213 SEPT. 18, 1912.

Patente F6125, 1913.

.ATTORNEVS eEsT AVAlLABLE cos UNITED STATES PATENT OFFICE.

FRITZ A. SCHNEIDER, OF NEW YORK, N. Y.

SAFETY ATTACHMENT FOR COMPRESSION REFRIGERATING APPARATUS.

To all whom. it may concern:

Be it known that I, Fnrrz A. Scunnmna, a citizen of the United States, and a resident of the citv of New York, borough of the Bronx, in the county and State of New York, have invented a new and Improved Safety Attachment for Compression Refrigerating Apparatus, of whic i the followin is a full. clear, and exactdescription.

The invention relates to refrigerating and ice-making systems, and its object is to provide a new and improved safety attachment for compression refrigerating apparatus arranged to automatically shut otf the ammonia to,the expansion coils, and to sound an alarni in case the pressure in the systems exceeds the normal pressure.

In order to accomplish the desired result use is made of means utilizing excess pressure of the ammonia for closing a valve. controlling the ammonia to the expansion coils, and for sounding an alarm.

A practical embodiment of the invention is represented in the accompanying drawings forming a )art of this specification, in which similar characters of reference indicate corresponding parts in both views.

Figure 1 is a side elevation, partly in section, of the safety attachment for compression refrigerating apparatus; and Fig. 2 is an enlarged sectional side elevation of the relief or controlling valve.

The compressor A of the refrigerator and ice-making system may be of any approved construction, and its steam motor is connectcd by a steam supply pipe B with a boiler or other source of steam sup ly for driving the motor and consequently the coinpressor A. A dischar e pipe C leading from the cylinder A of tie compressor A connects in the usual uuinner with the condcnscr D connected by a pipe E with a liquid ammonia tank I to connect by a pipe G with the expansion coils (not shown) and which are connected with the suction pipe II of the cylinder A.

The ammonia refrigerating and ice-making system so far described is of the usual construction, and the safety attachment is applied to this system in the following manner: The discharge pipe C is connected by a small p pe I with a relief valve J connected by a pipe K with one end of a cylinder L containing a piston N provided with a piston rod N. The outer end of the piston rod N is provided with spaced pins N, N, between which extends the free Specification of Letters Yatent.

Application filed September 18, 1912.

Patented Feb. 25, 19.13.

Serial No. 720.943.

end of an arm 0 attached to the stem 1" of a shut-off valve 1 held in the ipe (l,

reviously mentioned, and connecting the liquid ammonia tank 1* with the expansion coils. When the system is in use the valve P is 0 wood and the piston N is in the upper end 0 the cylinder L, as indicated in Fig. 1. The lower portion of the cylinder l, is connected by a pipe Q, with the suction pipe H of the compressor A, and the arrangement is such that when the piston N moves into a lowermost position, as hereinafter more fully described. it passes the entrance end of the pipe Q into the. cylinder L so that the pi )es K and Q are connected with each other )y the interior of the cylinder L.

The relief valve J is shown in detail in Fig. 2 and is constructed as follows: The body J of the valve J is provided in its lower )ortion with a valve seat J connected with tie pipe I, and on the said valve seat J is normally seated a valve J having a valve stem J mounted to slide in a regulating plug J screwing in the upper end of the body J'. A s )ring J" is interposed between the valve J and the bottom of the plug J, and the tension of the spring J can be increased or diminished by screwing the lug J farther down or further up in the iiody J. A packing gland J engages the plug J and screws on the body J to render the connection of the plug with the body tight to n'event leakage of gas. A packing gland i1 held on the upper end of the plug J engages the stem J to prevent leakage of ms by way of the slidiiu connection of t ie valve stem J in the pliig J. The upper, outer end of the valve stem .l' is adapted to en age the arm it of a valve. R of a whistle t or other alarm connected with the steam supply pipe B. It is understood that the valve J is held to its seat J by the spring J against the pressure of the ammonia gas passing through the pipe C, and the spring J is adjusted to the normal pressure under which the system is working at the time. Thus as long as the system C is run under normal pressure or below the same the valve J remains closed and consequently the pipes I and K are disconnected, but when the pressure in the discharge pipe C increases beyond a normal pressure hen the valve J opens and connection is made between the pipes I and l\'.

Presuming that the normal pressure in the pipe C is not to exceed 150 lbs., then in case of an excess pressure in the said il (l ltit) ll l sEsT AVAiLABLE co pi ie C the valve J is moved into open position against the tension of the spring J and ammonia gas now passes from the pipe C by way of the pi e I, valve J and pipe K into the upper enc of the cylinder L and forces the piston N downward therein, thus moving the valve P into closed position and thereby shutting off the ammonia from the liquid tank F to the expansion coils. When the piston N has reached its lowermost position it uncovers the entrance end of the pipe Q, so that the ammonia gas in the cylinder It can now pass through the pipe Q, into the suction pipe H and into the cylinder A to increase the load at the suction end of the cylinder A to thus tend to re-' duce the speed of the compressor. \Vhen the valve J moves into open position, as described, the stem J acts on the arm R so that the valve R is opened and the whistle It is sounded by steam from the steam supply pipe B, thereby notifying the attendant in charge that the system had been running under more than normal pressure.

Irom the foregoin it will be seen that by the arrangement (escribed the ammonia to the expansion coils is shut off, and an alarm is sounded so that a dangerous explosion or bursting of pipes in the system is avoided, and the attendant is notified to rectifv matters.

Iaving thus described my invention, 1 claim as new and desire to secure by Letters Iatcnt:

1. In a refrigerating machine, a compressor, delivery and suction conduits connected with the said compressor, a shut-oil' valve for shutting off the outilowing fluid, a relief valve connected with the said dclivery conduit. and a controllin device connected with the said relief va re and with the said shut-oil valve to close the latter on excess pressure mssing by way of the relief valve to the said controlling device.

.2. In a refrigerating machine. a cumpressor, delivery and suction conduits connected with the compressor, a relief valve connected with the said delivery conduit, a condenser connected with the said delivery conduit, a tank connected with the said condenser and having an outlet provided with a shut-oil valve, and a controlling device connected with the said relief valve and with the said shut-off valve.

3. In a refrigerating machine. a compressor, delivery and suction conduits connected with the compressor, a relief valve connected with the said delivery conduit, a condenser connected with the said delivery conduit, a tank connected with the said condenser and having an outlet provided with a shut-oil valve, and a cylinder provided with a piston connected with the said shutoff valve, the said cylinder bein connected with the said relief valve to adlow excess ressure to pass by way of the relief valve into the said cylinder to move the piston therein and to close the said shut-off valve.

4. In a refrigerating machine a compressor, delivery and suction conduits connected with the compressor, a relief valve connected with the said delivery conduit, a condenser connected with the said delivery conduit, a tank connected with the said condenser and having an outlet provided with a shut-oil valve, a cylinder provided \Vlill a )iston connected with the said shut-off valve, the said cylinder being connected with the said relief valve to allow excess pressure to pass by way of the relief valve mto the said cylinder to move the piston therein and to close the said shut-off valve, and a connection between the said cylinder and the said suction conduit, the entrance end of the said connection into the cylinder being adapted to be uncovered by the said piston to connect the delivery and suction conduits with each other.

5. In a refrigerating machine, a compressor, delivery and suction conduits, connected with the compressor, a relief valve connected with the pressure side of the compressor of the system, a cylinder containing a piston and connected at one end with the said valve, and a pipe connecting the other end of the said cylinder with the suction side of the said compressor, the entrance end of the said pipe into the cylinder being adapted to be uncovered by the said piston to connect the cylinder pipes with each other.

(i. In a refrigerating machine, a compressor, delivery and suction conduits, connected with the con'ipressor, a relief valve connected with the pressure side of the compressor system, a cylinder containing a piston and connected at one end with the said valve, a shut-oil valve in the outgoing pipe of the system and connected with the said piston, and a pi )e connecting the other end of the said cylinder with the suction side of the said compressor, the entrance end of the said pipe into the cylinder being adapted to be uncovered by the said piston to connect the cylinder pipes with each other.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

FRITZ A. SCHNEIDER.

Witnesses 'luso. G. Hosraa, Pmmr D. ROLLHAUS.

Copies of thtl patent may be obtained for ttve cents each. by addressing the Commissioner of Patents. Washington, D. C."

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